The Bamberg Codex (c.1300) is one of the most important
sources for Ars Antiqua motets. It consists of over 100 three-part
motets, together with a single four-part motet (track #1) and a
single conductus (also in three parts). Many of these motets
represent slightly different versions of works contained in other
major motet sources from the period, including some in instrumental
adaptation. In addition, the Codex includes the treatise Practica
artis musice (1271) by someone named Amerus.